Image manipulating

Question

hi, this is my problem:
i would like to be able read an image-file from the disk and i would like to scale it depending
on it's size... if it's to big i would like to make it smaller.. :) if it's possible it would be good
to be able to scale the image in both file-size and image-size.
is there any standard classes for this or does anyone know about any good packages?
would also be nice if anyone good give me a good example of the procedure.
thanx!
/Andy

Answer 1

yes this can be done here is some code tht will show you how to do it. you will need to replace the images files that are in the code with ones of your own.... Also you need to be aware that java only supports Jpg and gif's ...nothing else.
// Start of the code. Cut paste compile and run For what you want look for "varient "B" in the Code and // comment out one or the other and run you will see the difference. You must supply your own jpg's or
// gif's!!
* @version step2 of4
* @author Phil Ygnacio email: [email protected]
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class ButtonPanel extends JPanel
implements ActionListener
public ButtonPanel()
Certifications = new JButton( "photo", new ImageIcon("blueball.gif"));
ResumeButton = new JButton("Test 1", new ImageIcon("blueball.gif"));
CertificationsButton = new JButton("Test 2", new ImageIcon("blueball.gif"));
add(Certifications);
add(ResumeButton);
add(CertificationsButton);
Certifications.addActionListener(this);
ResumeButton.addActionListener(this);
CertificationsButton.addActionListener(this);
setBackground(Color.black);               // set first Backgrnd color
     image = Toolkit.getDefaultToolkit().getImage
("Phil_11kb.gif");               // Grab the image you need in current directory.
MediaTracker tracker = new MediaTracker(this); // P. 309 & 241
tracker.addImage(image, 0);
try { tracker.waitForID(0); }          // Wait to load completely. P. 309
catch (InterruptedException e) {}
public void actionPerformed(ActionEvent evt)
{ Object source = evt.getSource();
Color color = getBackground();
if (source == Certifications)
                    color = Color.yellow;
image = Toolkit.getDefaultToolkit().getImage
("Phil_11kb.gif");               // Grab the image you need in current directory.
MediaTracker tracker = new MediaTracker(this); // P. 309 & 241
tracker.addImage(image, 0);
try { tracker.waitForID(0); }                    // Wait to load completely. P. 309
catch (InterruptedException e) {}
               repaint();
else if (source == ResumeButton)
          {color = Color.blue;}
else if (source == CertificationsButton)
          {color = Color.red;}
setBackground(color);               // set second Backgrnd colors based on choice
public void setFonts(Graphics g)     // Set the fonts and the font characteristics
{ if (f != null) return;                    // Test for no Fonts set
f = new Font("SansSerif", Font.BOLD, 28);          // Initialize private Var's.
fi = new Font("Serif",
Font.BOLD + Font.ITALIC, 18);          // Initialize private Var's.
     fm = g.getFontMetrics(f);          // Get the font metrics of the set fonts. P. 289
fim = g.getFontMetrics(fi);
public void paintComponent(Graphics g)          // This is where the graphic is displayed
{ super.paintComponent(g);
Dimension d = getSize();                         // Size of the current Window frame.
int clientWidth = d.width;
int clientHeight = d.height;
int imageWidth = image.getWidth(this);
int imageHeight = image.getHeight(this);
g.drawImage(image, 240, 50, (imageWidth), (imageHeight), this);
// varient "B" P.307/312 no stretch ability
// g.drawImage(image, 0, 0, (clientWidth), (clientHeight), this);
// varient "B" with stretch ability
setFonts(g);
String s1 = "Hey!! Look at this!";     // Initialize strings
String s2 = "I can do ";
String s3 = " GRAPHICS NOW!!";
int w1 = fm.stringWidth(s1);     // fm is private and get stringWidth of (s1)
int w2 = fim.stringWidth(s2);
int w3 = fm.stringWidth(s3);
d = getSize();               // get size of current Window
int cx = (d.width - w1) / 2;
int cy = (d.height - fm.getHeight()) / 2
+ fm.getAscent();               // get Total height of string using this font
g.setFont(f);                    // set the fonts on the strings and print them
g.setColor(Color.red.brighter().brighter().brighter()); // see page 292 "TIP"
g.drawString(s1, (cx+15), cy);
cx += w1;
cx = (d.width - w1 - w2 - w3) / 2;
cy = (d.height - fm.getHeight()) / 2
+ fm.getAscent();               // get Total height of string using this font
g.setFont(fi);
g.setColor(Color.black); // see page 292 "TIP"
g.drawString(s2, (cx+185), (cy+30));
cx += w2;
g.setFont(fi);
g.setColor(Color.blue); // see page 292 "TIP"
g.drawString(s3, (cx+185), (cy+30));
private Font f;
private Font fi;
private FontMetrics fm;
private FontMetrics fim;
private Image image;
private JButton Certifications;
private JButton ResumeButton;
private JButton CertificationsButton;
class ButtonFrame extends JFrame
public ButtonFrame()
{ setTitle("Step Two Advanced Button Test");
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
Toolkit tk = Toolkit.getDefaultToolkit();               // see page 273 Re: Toolkit
Dimension d = tk.getScreenSize();
int screenHeight = d.height;
int screenWidth = d.width;
setSize(screenWidth , screenHeight );          // see page top of P.273 for
setLocation(screenWidth/256, screenHeight/256 );      // why these parametes are used!!                                    // ... or you can use whole numbers
                              // to set the Loc
/* setSize(screenWidth / 2 , screenHeight / 2);          // see page top of P.273 for
setLocation(screenWidth / 4, screenHeight / 4);      // why these parametes are used!!                          // ... or you can use whole numbers
*/           // to set the Loc                                                  
Image img = tk.getImage("Tree1.gif");     // sets the conner graphic
setIconImage(img);
Container contentPane = getContentPane();
contentPane.add(new ButtonPanel());
public class StepTwoAdvancedButtonTest
public static void main(String[] args)
{ JFrame frame = new ButtonFrame();
frame.show();
// end of the code
PS
New Study group starting.... We will be using the text called:
"Core Java2 Volume 1 Fundamentals" and "Core Java2 Volume 2" for advanced programmers. We will all use the same text and examples to learn from. Anyone is welcome,..but if you want to ask questions you will need to have this specific text and this text only and we will be using the example code from it to learn from.
Students in school are welcome but you MUST have this text so that we can refer you to specific pages for help with your projects.
The group will be following the texts VERY closely, but it does not matter where in the text you are or at level of experience you are at....ALL THAT MATTER IS THAT YOU HAVE THE TEXT THAT THE GROUP IS USING....
For more info write Phil Ygnacio at [email protected]
come on by!!